org.apache.datasketches.hive.theta

Class EstimateSketchUDF

java.lang.Object

org.apache.hadoop.hive.ql.exec.UDF

org.apache.datasketches.hive.theta.EstimateSketchUDF

public class EstimateSketchUDF
extends org.apache.hadoop.hive.ql.exec.UDF

Hive estimate sketch udf. V4

Constructor Summary

Constructors

Constructor and Description
EstimateSketchUDF()

Method Summary

Modifier and Type	Method and Description
Double	evaluate(org.apache.hadoop.io.BytesWritable binarySketch) Returns the estimate unique count of sketch.
Double	evaluate(org.apache.hadoop.io.BytesWritable binarySketch, long seed) Returns the estimate unique count of sketch.

Methods inherited from class org.apache.hadoop.hive.ql.exec.UDF

getRequiredFiles, getRequiredJars, getResolver, setResolver

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

EstimateSketchUDF

public EstimateSketchUDF()

Method Detail

evaluate

public Double evaluate(org.apache.hadoop.io.BytesWritable binarySketch)

Returns the estimate unique count of sketch.

Parameters:

binarySketch - sketch to be estimated passed in as bytes writable.

Returns:

the estimate of unique count from given sketch.

evaluate

public Double evaluate(org.apache.hadoop.io.BytesWritable binarySketch,
                       long seed)

Returns the estimate unique count of sketch.

Parameters:

binarySketch - sketch to be estimated passed in as bytes writable.

seed - value used to build the sketch if different from the default

Returns:

the estimate of unique count from given sketch.